Abstract
The effect of silicon additions on the thermal stability and morphology of carbides has been investigated in a Ni-Mo-Cr superalloy. It is found that granular M6C carbides form at the grain boundaries in the standard heat. The size and morphology of M6C carbides remain unchanged in the aging treatment at 700–800 °C up to 1000 h. While in the non-silicon heat, the intergranular carbides are examined as M2C type carbides by TEM at the initial stage of the aging treatment. With the aging time increasing, the fine granular M2C carbides transform into coarse planar M6C carbides. It can be concluded that silicon additions can lead to the more stable intergranular carbides in the Ni-Mo-Cr superalloy.
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